<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>腾讯微云</title>

	</head>
	<body>
		<div>
			<h1>123123</h1>
			<button onclick="aaa()">123123</button>
			<button onclick="bbb()">11111</button>
		</div>
		<script>
			function aaa() {
				document.title = "我也不知道啊"
			}
			function bbb() {
				console.log(document.title)
				const timer = setInterval(() => {
					if (document.title == "腾讯微云") {
						alert('还是微云')
						console.log('1')
					}
				}, 500);
			}
		</script>
		<script>
			
		</script>
	</body>
</html>
